Specifications

8-5
Cisco MGX 8260 Command Line Interface Guide
Release 1.2, Part Number 78-10987-01 Rev. B0, January, 2002
Chapter 8 Troubleshooting
Performing BERT Tests
DS1/E1 BERT Test
To use the DS1/E1 BERT test, follow these steps:
Step 1 Activate the test signal using the onbertds1 command as described in the “onbertds1” section on
page 9-357. For example, the following command activates the bert test on channel 1 of line 1 in slot
11 using a rand9Bit pattern with no error injection.
onbertds1 11.1 1 1 1
Step 2 Check the test results using the lsbertds1 command, specifying the slot and line number, delimited by
a period, of the DS1 line.
The system displays the BERT status:
=======================================================================
DS1 Bert Status (lsbertds1)
=======================================================================
DS1 Line : 11.1
Bert Status : inSync
Received Bit Pattern : 4050854036
Receive Count : 9345256
Receive Error Count : 0
Step 3 Stop the test using the offbertds1 command, specifying the slot and line number. For example:
offbertds1 11.1
The system stops the bert test and resumes transport of normal traffic.
Displayed
Information Description
DS1 Line The line for the test results.
Bert Status The status of the test, as follows:
1: idle
2: in-sync
3: out-of-sync
4: failed
Received Bit Pattern The bit pattern the receiver synchronized on.
Receive Count The number of bits received during the BERT test. Use this parameter with the
Receive Error Count to calculate the Bit Error Rate (BER).
Receive Error Count The number of error bits received during the BERT test. Use this parameter
with the Receive Count to calculate the Bit Error Rate (BER).